map = {None: "te"}
print(map)
print(map[None])
print(len(map))

m = {}
print(len(m))
if not m:
    print("wu")
m["d"] = 1
m["d"] = 2
print(m["d"])
if not m:
    print("wu")

print(m.get("test"))
# print(m["test"])
# for k, v in map:
#     print(k, v)
